[PretzelPirate]

It’s pretty easy to make it hard to move your crypto while you maintain access to all keys involved. It becomes even easier if you use a blockchain that supports smart contracts.

Something as simple as using a contract to delay any coin transfers with one or more keys that can stop the transfer is trivial to implement.

Even simple multi-sig is pretty good assuming you don’t rely on two keys both stored in your phone.

For everyday payments, you can use a mobile phone wallet without these protections and worst case you lose a small amount of money if someone takes your phone. It’s just like getting your real wallet stolen and losing cash.

[gruez]

Seems like even bitcoin supports it, even though it's not typically thought of as a "smart contract" platform.

https://en.bitcoin.it/wiki/Timelock

[statoshi]

Indeed; I wrote an article last year about time locking. https://blog.keys.casa/bitcoin-multisig-time-locking-challen...